Northwestern California

  North Coast
  Klamath Ranges
  North Coast Ranges
Outer
High
Inner


Cascade Ranges

  Cascade Range Foothills
  High Cascade Range


Sierra Nevada

  Sierra Nevada Foothills
Northern
Central
Southern
  High Sierra Nevada
Northern
Central
Southern
  Tehachapi Mountains


Great Central Valley

  Sacramento Valley
  San Joaquin Valley


Central Western California

  Central Coast
  San Francisco Bay Area
  South Coast Ranges
Outer
Inner


Southwestern California

  South Coast
  Channel Islands
Northern
Southern
  Transverse Ranges
Western
San Gabriel
San Bernardino
  Peninsular Ranges
San Joaquin Mountains


Desert Province

  Mojave Desert
  Desert Mountains
  Sonoran Desert


Great Basin Province

  Modoc Plateau
  Warner Mountains
  East of Sierra Nevada
  White and Inyo Mountains